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Hybrid follicular cyst in a dog. The cyst wall is lined by stratified squamous epithelium with a prominent granular cell layer (black arrow) and lamellar flaky keratin (green arrow) resembling an infundibular cyst. The cyst wall is also lined by small basaloid epithelium (red arrow) resembling a matrical cyst with abrupt keratinization into ghost cells (blue arrow).
